Words that contain 'pn' and end in 'am'

Sad to say only 3 results has been found based on this specific letter combination.

10 letter words

  • pneumogram

12 letter words

  • pneumatogram

19 letter words

  • pneumoencephalogram

What's the maximum number of words one can put together using this combination of letters?
There are 3 words covering all variations.

What's the biggest word you can assemble using this list?
'Pneumoencephalogram' is the longest word that Dictionarypedia could assemble, which has 19 characters